There are so many variables involved in this. Where do you live? Food costs will be different from place to place. Is health a concern? I could eat a bunch of ramen and spend less than $7 a week probably, but that's not a good idea! Do you grow your own food? Do you even have space to do so? Do you know how to cook? Etc. etc.
My point isn't that people cannot feed themselves for $7 a day, just that the difficulty involved is going to vary greatly from person to person.
My point isn't that people cannot feed themselves for $7 a day, just that the difficulty involved is going to vary greatly from person to person.